ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,458,478, issued on Nov. 4, was assigned to SMDsolution Co. Ltd. (Seoul, South Korea).

"Oral cavity cleaner for supplying washing water and discharging contaminated water" was invented by Sungkwon Ko (Chuncheon-si, South Korea) and Hyunjong Kim (Seongnam-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "An oral cavity cleaner includes a mouthpiece that sprays washing water into the oral cavity, a core suction part that suctions contaminated water formed by mixing the washing water and saliva inside the oral cavity, and a handle having an inflow path for introducing the washing water, a discharge flow path for removing the contaminated water, ...